Initial commit (day3p1)

day1p1/Makefile

@@ -0,0 +1,8 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+.PHONY: all
+all: main
+
+.PHONY: clean
+clean:
+	rm -f main

day1p1/main.c

@@ -0,0 +1,25 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int main()
+{
+    int value = 0;
+    char *line = NULL;
+    size_t line_len = 0;
+    FILE *f = fopen("input", "r");
+    if (!f) {
+        perror("input");
+        return 1;
+    }
+
+    while (getline(&line, &line_len, f) != -1) {
+        long number = strtol(line, NULL, 0);
+        value += number;
+    }
+
+    printf("%d\n", value);
+
+    free(line);
+    fclose(f);
+    return 0;
+}

day1p1/main.lua

@@ -0,0 +1,7 @@
+value = 0
+
+for line in io.lines("input") do
+    value = value + tonumber(line)
+end
+
+print(value)

day1p2/Makefile

@@ -0,0 +1,16 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+LIBS := glib-2.0
+CFLAGS += $(shell pkg-config --cflags $(LIBS))
+LDLIBS := $(shell pkg-config --libs $(LIBS))
+
+.PHONY: all
+all: main main_hash
+
+.PHONY: clean
+clean:
+	rm -f main main_hash
+
+main_hash: CFLAGS += -DUSE_HASH
+main_hash: main.c
+	$(LINK.c) $^ $(LOADLIBES) $(LDLIBS) -o $@

day1p2/main.c

@@ -0,0 +1,75 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <glib.h>
+
+/*
+ * Apparently using a hash table for this is much faster...
+ *
+ * $ time ./main
+ * 69285
+ * ./main  271,27s user 0,11s system 99% cpu 4:33,04 total
+ * $ time ./main_hash
+ * 69285
+ * ./main_hash  0,13s user 0,02s system 98% cpu 0,156 total
+ */ 
+
+#ifndef USE_HASH
+gpointer g_array_lookup(GArray *array, gpointer item, guint size)
+{
+    for (gchar *i = array->data; i < array->data + array->len * size; i += size) {
+        if (memcmp(i, item, size) == 0) {
+            return i;
+        }
+    }
+    return NULL;
+}
+#endif
+
+int main()
+{
+    long value = 0;
+    char *line = NULL;
+    size_t line_len = 0;
+    FILE *f = fopen("input", "r");
+    if (!f) {
+        perror("input");
+        return 1;
+    }
+
+#ifdef USE_HASH
+    GHashTable *hash = g_hash_table_new(g_direct_hash, g_direct_equal);
+    g_hash_table_insert(hash, GINT_TO_POINTER(value), GINT_TO_POINTER(TRUE));
+#else
+    GArray *array = g_array_new(FALSE, FALSE, sizeof(long));
+    g_array_append_val(array, value);
+#endif
+
+    while (1) {
+        rewind(f);
+        while (getline(&line, &line_len, f) != -1) {
+            long number = strtol(line, NULL, 0);
+            value += number;
+
+#ifdef USE_HASH
+            if (g_hash_table_lookup(hash, GINT_TO_POINTER(value))) goto found;
+            g_hash_table_insert(hash, GINT_TO_POINTER(value), GINT_TO_POINTER(TRUE));
+#else
+            if (g_array_lookup(array, &value, sizeof(long))) goto found;
+            g_array_append_val(array, value);
+#endif
+        }
+    }
+found:
+
+    printf("%ld\n", value);
+
+#ifdef USE_HASH
+    g_hash_table_destroy(hash);
+#else
+    g_array_free(array, TRUE);
+#endif
+    free(line);
+    fclose(f);
+    return 0;
+}

day2p1/Makefile

@@ -0,0 +1,8 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+.PHONY: all
+all: main
+
+.PHONY: clean
+clean:
+	rm -f main

day2p1/input

@@ -0,0 +1,250 @@
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day2p1/main.c

@@ -0,0 +1,57 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int compare_char(const void *a, const void *b)
+{
+    return *(const char *)a - *(const char *)b;
+}
+
+char find_reoccurrence(const char *array, const ssize_t len, const int times)
+{
+    if (!len) return 0;
+    if (!times) return 0;
+
+    char current = *array;
+    int count = 0;
+
+    for (const char *i = array; i < array + len; i++) {
+        if (*i == current) {
+            count++;
+            continue;
+        }
+        if (count == times) return current;
+        current = *i;
+        count = 1;
+    }
+
+    return count == times ? current : 0;
+}
+
+int main()
+{
+    char *line = NULL;
+    size_t line_len = 0;
+    ssize_t len = 0;
+    FILE *f = fopen("input", "r");
+    if (!f) {
+        perror("input");
+        return 1;
+    }
+
+    int twice = 0;
+    int thrice = 0;
+
+    while ((len = getline(&line, &line_len, f)) != -1) {
+        while (line[len - 1] == '\n') line[--len] = '\0';
+        qsort(line, len, sizeof(char), compare_char);
+
+        if (find_reoccurrence(line, len, 2)) twice++;
+        if (find_reoccurrence(line, len, 3)) thrice++;
+    }
+
+    printf("%d\n", twice * thrice);
+
+    free(line);
+    fclose(f);
+    return 0;
+}

day2p2/Makefile

@@ -0,0 +1,12 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+LIBS := glib-2.0
+CFLAGS += $(shell pkg-config --cflags $(LIBS))
+LDLIBS := $(shell pkg-config --libs $(LIBS))
+
+.PHONY: all
+all: main
+
+.PHONY: clean
+clean:
+	rm -f main

day2p2/input

@@ -0,0 +1,250 @@
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day2p2/main.c

@@ -0,0 +1,68 @@
+#include <stdio.h>
+
+#include <glib.h>
+
+int strcmpmatch(const char *a, const char *b)
+{
+    int result = 0;
+    while (*a && *b) if (*a++ == *b++) result++;
+    return result;
+}
+
+void stripnoncommon(char *a, const char *b)
+{
+    while (*a && *b) {
+        if (*a++ != *b++) {
+            memmove(a - 1, a, strlen(a));
+            a--;
+        }
+    }
+    *a = '\0';
+}
+
+int main()
+{
+    gchar *contents;
+    gchar **strings;
+    GError *err = NULL;
+
+    g_file_get_contents("input", &contents, NULL, &err);
+    if (err) {
+        fprintf(stderr, "%s\n", err->message);
+        g_error_free(err);
+        return 1;
+    }
+    g_strstrip(contents);
+    strings = g_strsplit(contents, "\n", -1);
+    g_free(contents);
+
+    int bestmatch_len = 0;
+    char *bestmatch_1 = NULL;
+    char *bestmatch_2 = NULL;
+
+    for (char **first = strings; *first; first++) {
+        for (char **second = strings; *second; second++) {
+            if (first == second) continue;
+
+            int len = strcmpmatch(*first, *second);
+            if (len <= bestmatch_len) continue;
+            bestmatch_1 = *first;
+            bestmatch_2 = *second;
+            bestmatch_len = len;
+        }
+    }
+
+    if (!bestmatch_1 || !bestmatch_2) {
+        puts("No match found!");
+        goto end;
+    }
+
+    char *final = g_strdup(bestmatch_1);
+    stripnoncommon(final, bestmatch_2);
+    puts(final);
+    g_free(final);
+
+end:
+    g_strfreev(strings);
+    return 0;
+}

day3p1/Makefile

@@ -0,0 +1,12 @@
+CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
+
+LIBS := glib-2.0
+CFLAGS += $(shell pkg-config --cflags $(LIBS))
+LDLIBS := $(shell pkg-config --libs $(LIBS))
+
+.PHONY: all
+all: main
+
+.PHONY: clean
+clean:
+	rm -f main

day3p1/main.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+
+#include <glib.h>
+
+struct claim {
+    unsigned id;
+    unsigned x;
+    unsigned y;
+    unsigned w;
+    unsigned h;
+};
+
+struct claim *parseclaims(unsigned *len, const char *fname)
+{
+    FILE *f = fopen(fname, "r");
+    if (!f) {
+        perror(fname);
+        return NULL;
+    }
+
+    GArray *array = g_array_new(FALSE, FALSE, sizeof(struct claim));
+    *len = 0;
+
+    char *line = NULL;
+    size_t line_len = 0;
+    while (getline(&line, &line_len, f) != -1) {
+        struct claim claim = {0};
+
+        // Haha what is proper parsing
+        sscanf(line, "#%u @ %u,%u: %ux%u",
+                &claim.id,
+                &claim.x,
+                &claim.y,
+                &claim.w,
+                &claim.h
+        );
+
+        g_array_append_val(array, claim);
+        (*len)++;
+    }
+
+    free(line);
+    fclose(f);
+    struct claim *res = (struct claim *)g_array_free(array, FALSE);
+    return res;
+}
+
+int main()
+{
+    unsigned claims_len;
+    struct claim *claims = parseclaims(&claims_len, "input");
+    if (!claims) return 1;
+
+    char (*tilemap)[1000] = g_malloc0(sizeof(char[1000][1000]));
+
+    for (struct claim *claim = claims;
+            claim < claims + claims_len; claim++) {
+        // Basic sanity check
+        if (claim->y > 1000 ||
+                claim->y + claim->h > 1000 ||
+                claim->x > 1000 ||
+                claim->x + claim->w > 1000) {
+            fprintf(stderr, "Warning: Ignoring out-of-bounds claim: "
+                    "#%u @ %u,%u: %ux%u\n",
+                    claim->id,
+                    claim->x,
+                    claim->y,
+                    claim->w,
+                    claim->h
+            );
+            continue;
+        }
+
+        for (unsigned y = claim->y; y < claim->y + claim->h; y++) {
+            for (unsigned x = claim->x; x < claim->x + claim->w; x++) {
+                if (tilemap[y][x] >= 2) continue;
+                tilemap[y][x]++;
+            }
+        }
+    }
+
+    int tally = 0;
+    for (char *i = *tilemap; i < *tilemap + 1000 * 1000; i++) {
+        if (*i >= 2) tally++;
+    }
+
+    printf("%d\n", tally);
+
+    g_free(claims);
+    g_free(tilemap);
+    return 0;
+}